package opera;

import book.Book;
import book.Booklist;

import java.util.Scanner;

public class DelOperation implements IOPeration{
    @Override
    public void work(Booklist booklist) {
        System.out.println("删除图书");
        System.out.println("请输入你要删除的图书的名字：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int currentSize = booklist.getUsedSize();
        int index = -1;
        for (int i = 0; i < currentSize; i++) {
            Book tmp = booklist.getBook(i);
            if (tmp.getName().equals(name)){
                index = i;
                break;
            }
        }
        //挪动数据
        for (int j = index; j < currentSize-1 ; j++) {
            Book book = booklist.getBook(j+1);
            booklist.setBook(j,book);
        }
        //修改size
        booklist.setUsedSize(currentSize-1);
        //因为删除的是对象，所以把最后一个置为null
        booklist.setBook(currentSize-1,null);
        System.out.println("删除成功");
    }
}
